CAN COMMUNICATION SYSTEM(for RHD with Central Gateway ECU) Blind Spot Monitor Sensor Communication Stop Mode

DESCRIPTION

Detection Item Symptoms Trouble Area
Blind Spot Monitor Sensor Communication Stop Mode

Either condition is met:


  • "Blind Spot Monitor Master" is not displayed on "CAN Bus Check".

    Click here

  • Communication system DTCs (DTCs that start with U) that are output correspond to "Blind Spot Monitor Sensor Communication Stop Mode" in "DTC Combination Table".

    Click here


  • Power source or inside blind spot monitor sensor LH

  • Blind spot monitor sensor LH CAN branch wire or connector

  • Blind spot monitor sensor LH

WIRING DIAGRAM

B0029NYE10

CAUTION / NOTICE / HINT

Note


  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

    Click here

  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • DTC check procedure: Turn the ignition switch to ON and turn the blind spot monitor main switch on, and then wait 8.76 seconds or more.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

    Click here

Tech Tips


  • Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (BLIND SPOT MONITOR SENSOR LH CAN BRANCH WIRE)


    1. B002A38C01
      *a

      Front view of wire harness connector

      (to Blind Spot Monitor Sensor LH)

      Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the blind spot monitor sensor LH connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      R1-2 (CA1P) - R1-7 (CA1N) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Result Proceed to
      OK (w/o Stop and Start System) A
      OK (w/ Stop and Start System) B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR LH - BATTERY AND BODY GROUND) Click here

    C

    REPAIR OR REPLACE BLIND SPOT MONITOR SENSOR LH CAN BRANCH WIRE OR CONNECTOR (CA1P, CA1N)

    A

  2. CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR LH - BATTERY AND BODY GROUND)


    1. B002A38C02
      *a

      Front view of wire harness connector

      (to Blind Spot Monitor Sensor LH)

      Connect the cable to the negative (-) battery terminal.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Click here

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      R1-5 (BLB) - Body ground Ignition switch ON 11 to 14 V

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      R1-10 (BLGD) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BLIND SPOT MONITOR SENSOR LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR LH - BATTERY AND BODY GROUND)


    1. B002A38C02
      *a

      Front view of wire harness connector

      (to Blind Spot Monitor Sensor LH)

      Connect the cable to the negative (-) battery terminal.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Click here

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      R1-5 (BLB) - Body ground Ignition switch ON 10.5 to 16 V

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      R1-10 (BLGD) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (BLB terminal) B
      NG (BLGD terminal) C

    A

    REPLACE BLIND SPOT MONITOR SENSOR LH Click here

    B

    GO TO STOP AND START SYSTEM for 2WW: GO TO STOP AND START SYSTEM Click here
    GO TO STOP AND START SYSTEM for 3ZR-FAE: GO TO STOP AND START SYSTEM Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR